The 15-year-old's family announced her death online after searching for her for hours.
Her aunt, Sylvia Pritchett, said in a Facebook post that she has "a broken heart and a soul that just can't process all this right now."
The senior pastor at Dayspring Church says Ramirez was a member of the Santa Fe church's youth ministry, and often attended with her younger brother.
Rev. Brad Drake described her as "a sweet young lady, with a style all her own."
One friend wrote on her Facebook page, "She was a wonderful young lady and will be greatly missed."